[adrianN]

Doing that is part of the plan for the switch to renewables, and people are actively working on it. A friend of mine at Siemens energy for example is involved in such projects.

[p_l]

Yes, there are people working on that.

Unfortunately they aren't the people who drive energy policy in practice or who fund new generation (most of the time, at least).

From capitalist point of view, it's always easier to turn profit by market speculation[1], with providing gas turbine backup second.

[1] I work for considerably big wind power company building off shore wind turbines. Our main revenue source is market speculation :<